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21st Annual Smithsonian Magazine Photo Contest Natural World
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They are Parahucho perryi which classified as CRITICALLY ENDANGERED according to IUCN Red List. The female was filling in vigorously the eggs she had spawned.

Photo Detail
Date Taken: 05.2023
Date Uploaded: 11.2023
Photo Location: Minamifurano, Japan
Camera: NIKON D850
Copyright: © Sayaka Ichinoseki